Thermostat



FIG. 1 is a perspective view as seen from the front and bottom side of a thermostat showing the new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left elevational view thereof;

FIG. 5 is a right elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom view thereof. 

I claim the ornamental design for a thermostat, as shown and described. 